i am curious, has anyone built up a Raspberry Pi computer for field logging. Maybe field day? NPOTA maybe?

They sell a small screen and keyboard. A portable mouse doesn't take up much more room. The Pi powers from USB, so a low power, in the field logging computer? I just got two Pi's and am thinking about trying this . . . In google search, I haven't run across this specifically yet.

The Kindle DX models tend to go for a higher price on eBay than even new paper white versions; partly due to their free 3G and the fact that they can be "unlocked". Some of the other Kindle models can also be jailbroken and there are ways to "tether" them via the 3G link. You'd have to do this sparingly as Amazon pays for that link and could possible "brick" a device that abuses it; but a time standard for JT-modes would probably be ok.

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